That fact scares Tara Cook-Littman, who works hard to keep her three kids away from GMOs.

"I don’t want my children to be guinea pigs," she said.

Genetically modified means the DNA of a crop has been scientifically altered to make it more resistant to insects, weather and disease. Those are huge advantages that allow higher yields and lower prices at the store.

The FDA claims they're safe, but environmental researcher Jesse Ausubel thinks there needs to be more studies done to determine long-term effects.

Reports show GMOs could alter the immune system, cause cancer, make people resistant to antibiotics and contribute to obesity. The latest GMO wheat has a new protein that stimulates appetites so we consume 440 more calories a day.